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New Post: Alternative

happynomad — Fri, 01 Feb 2013 00:29:36 GMT

This project looks great -- I wish I found it sooner. In fact, I already implemented an alternative which I blogged about today: http://happynomad121.blogspot.com/2013/01/data-binding-among-complex-expressions.html . I hope to get some feedback on my approach.

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Tue, 10 Jul 2012 14:32:30 GMT

For other programmers who are having problems with this kind of exception, I ended up having this code.

        private void CreateQueries()
        {
            var query = ExpressionObserver.Execute(() => (from o in _orders
                                                          where o.State != OrderStateEnum.Canceled
                                                          group o by o.Isin
                                                              into g
                                                              let name = _referenceData.GetInstrumentName(g.Key)
                                                              orderby name ascending
                                                              select GetComplexRowViewModel(
                                                                                            g.First()
                                                                                            ,
                                                                                            (from p in _quotes
                                                                                             where
                                                                                                 p.Isin == g.Key &&
                                                                                                 p.Exchange == _referenceData.GetPrimaryExchangeId(g.Key) &&
                                                                                                 p.Provider == ProviderEnum.Bloomberg
                                                                                             select GetSimpleRowViewModel(p))
                                                                                             ,
                                                                                             (from q in _quotes
                                                                                              where
                                                                                                  q.Isin == g.Key &&
                                                                                                  q.Provider == ProviderEnum.Tradebase &&
                                                                                                  g.Select(s => s.Exchange).Contains(q.Exchange)
                                                                                              select GetSimpleRowViewModel(q))
                                                                                              ,
                                                                                              (from o in _orders
                                                                                               where o.Isin == g.Key
                                                                                               && o.State != OrderStateEnum.Canceled
                                                                                               group o by new { o.LimitPrice, o.OrderSide } into x
                                                                                               select GetCompressedRowViewModel
                                                                                               (
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? (decimal?)x.Key.LimitPrice : (decimal?)null,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? x.Select(s => s.Quantity).Aggregate((c, n) => c + n) : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? (decimal?)x.Key.LimitPrice : (decimal?)null,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? x.Select(s => s.Quantity).Aggregate((c, n) => c + n) : 0,
                                                                                                   string.Join(", ", x.Select(s => s.Exchange)),
                                                                                                   x.First().Isin.ToString(),
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? x.Count() : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? x.Count() : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? RowSide.Sell : RowSide.Buy
                                                                                               ))
                                                                   ,
                                                                   (from o in _orders
                                                                    where o.Isin == g.Key
                                                                    && o.State != OrderStateEnum.Canceled
                                                                    select GetUncompressedRowViewModel(o))
                                                                  
                                                                                             ))).Cascade();
            GridData = query;
        }


        // Obtics 
        private ConcurrentDictionary<string, ComplexRowViewModel> _complexRowViewModels = new ConcurrentDictionary<string, ComplexRowViewModel>();
        private ComplexRowViewModel GetComplexRowViewModel(OrderStatusViewModel model, IEnumerable<SimpleRowViewModel> primaryExchanges, IEnumerable<SimpleRowViewModel> groupped
            , IEnumerable<CompressedRowViewModel> compressed, IEnumerable<UncompressedRowViewModel> uncompressed)
        {
            if (model == null)
                return _complexRowViewModels.GetOrAdd("", s2 => new ComplexRowViewModel());

            return _complexRowViewModels.GetOrAdd(model.Isin,
                                                  s2 =>
                                                  new ComplexRowViewModel(_referenceData) { UnderlyingOrder = model, PrimaryExchange = primaryExchanges.First(), Groupped = groupped, Compressed = compressed, Uncompressed = uncompressed });
        }

        private ConcurrentDictionary<string, SimpleRowViewModel> _simpleRowViewModels = new ConcurrentDictionary<string, SimpleRowViewModel>();
        private SimpleRowViewModel GetSimpleRowViewModel(QuoteTickViewModel model)
        {
            if (model == null)
                return _simpleRowViewModels.GetOrAdd("", s2 => new SimpleRowViewModel());

            return _simpleRowViewModels.GetOrAdd(model.Isin + model.Exchange,
                                                                s2 =>
                                                                new SimpleRowViewModel() { UnderlyingQuote = model });
        }

        private ConcurrentDictionary<string, UncompressedRowViewModel> _uncompressedRowViewModels = new ConcurrentDictionary<string, UncompressedRowViewModel>();
        private UncompressedRowViewModel GetUncompressedRowViewModel(OrderStatusViewModel model)
        {
            if (model == null)
                return _uncompressedRowViewModels.GetOrAdd("", s2 => new UncompressedRowViewModel());

            return _uncompressedRowViewModels.GetOrAdd(model.InternalId,
                                                                s2 =>
                                                                new UncompressedRowViewModel() { UnderlyingOrder = model });
        }

        private ConcurrentDictionary<string, CompressedRowViewModel> _compressedRowViewModels = new ConcurrentDictionary<string, CompressedRowViewModel>();
        private CompressedRowViewModel GetCompressedRowViewModel(decimal? Ask, int AskSize, decimal? Bid, int BidSize, string Exchange, string Isin, int OrderBuyCount, int OrderSellCount, RowSide RowSide)
        {

            return new CompressedRowViewModel()
                       {
                           Ask = Ask,
                           AskSize = AskSize,
                           Bid = Bid,
                           BidSize = BidSize,
                           Exchange = Exchange,
                           Isin = Isin,
                           OrderBuyCount = OrderBuyCount,
                           OrderSellCount = OrderSellCount,
                           RowSide = RowSide
                       };
        }

So basically we what we can say is, Obtics is not entirely compatible with lambda and linq.

If you want to shape your viewmodels into another format or use surrogate classes or having aggregation with creating new classes on the fly, Obtics is not for you.

Thanks anyway.

New Post: Why is this collection keeps getting recreated everytime?

throb — Tue, 10 Jul 2012 13:43:08 GMT

It is probably the same issue as mentioned in this thread: http://obtics.codeplex.com/discussions/360575

The engine does not maintain a list with conversions. It uses your lambda function to find a conversion it needs for adding AND removing. So your lambda needs to return an equal result (not necessairily referentially equal) when it gets called with equal parameters. So:

X x = value;

Func<X,Y> yourLambda = <stuff>;

Assert.IsTrue(EqualityComparer<Y>.Default.Equals(yourLambda(x),yourLambda(x)));

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Mon, 09 Jul 2012 20:34:02 GMT

As far as I understand, obtics engine is still searching for the order with active state but at that time the object already got the cancelled state. so if not an equal object returns i get an error.

but the solutions is to keep a list with every orderstate which kind of impossible

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Mon, 09 Jul 2012 14:15:02 GMT

I am testing it for 3 days now. I've bumped my head to my desk several times because of this :) please help, I'm uploading my class which creates these queries.

http://www.4shared.com/file/ce_V8PPh/MarketData.html

Everything works fine until an OrderStatus gets a "Cancelled" state. I think it is because I filter the cancelled orders on top of the query. But how is this relevant I don't know. Anyway, the exception is:

InvalidOperationException, Added item does not appear at given index '0'.

But this totally makes no sense since the item is already there.

I'd be really glad if anyone can help me.

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Fri, 06 Jul 2012 13:40:46 GMT

Allright I've somehow fixed that problem but now I got a new one :)

Added item does not appear at given index '1'.

It is a typical threading problem but I really dont know what can I do about it.

'Pulse.UI.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll'A first chance exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dllSystem.Transactions Critical: 0 : <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Critical"><TraceIdentifier>http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/Unhandled</TraceIdentifier><Description>Unhandled exception</Description><AppDomain>Pulse.UI.vshost.exe</AppDomain><Exception><ExceptionType>System.InvalidOperationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>Added item does not appear at given index '1'.</Message><StackTrace> at MS.Internal.Data.EnumerableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args) at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args) at Obtics.NCToNCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.NotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedCascadeTransformation`2.BufferNodeCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedNotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.Values.Transformations.PropertyTransformation`2.Buffer_PropertyChanged(Object sender, EventArgs args) at Obtics.Values.Transformations.PropertyTransformation`2.npc_PropertyChanged(Object sender, PropertyChangedEventArgs e) at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e) at GalaSoft.MvvmLight.ViewModelBase.RaisePropertyChanged(String propertyName) in D:\GalaSoft\mydotnet\GalaSoft MVVM Light Toolkit\Source\V3\GalaSoft.MvvmLight\GalaSoft.MvvmLight (NET35)\ViewModelBase.cs:line 234 at Pulse.UI.ViewModels.OrderStatusViewModel.set_State(OrderStateEnum value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 236 at Pulse.UI.ViewModels.OrderStatusViewModel.set_Status(OrderStatus value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 80 at Pulse.UI.Common.MarketData.&lt;MessageHandler&gt;b__a(OrderStatusViewModel vm, OrderStatus m) in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 219 at Pulse.UI.Common.MarketData.&lt;&gt;c__DisplayClass20`2.&lt;CollectionKeeper&gt;b__1f() in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 333 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Pulse.UI.App.Main() in C:\Serkan\Pulse Project\Pulse.UI\obj\x86\Release\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()</StackTrace><ExceptionString>System.InvalidOperationException: Added item does not appear at given index '1'. at MS.Internal.Data.EnumerableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args) at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args) at Obtics.NCToNCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.NotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedCascadeTransformation`2.BufferNodeCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedNotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.Values.Transformations.PropertyTransformation`2.Buffer_PropertyChanged(Object sender, EventArgs args) at Obtics.Values.Transformations.PropertyTransformation`2.npc_PropertyChanged(Object sender, PropertyChangedEventArgs e) at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e) at GalaSoft.MvvmLight.ViewModelBase.RaisePropertyChanged(String propertyName) in D:\GalaSoft\mydotnet\GalaSoft MVVM Light Toolkit\Source\V3\GalaSoft.MvvmLight\GalaSoft.MvvmLight (NET35)\ViewModelBase.cs:line 234 at Pulse.UI.ViewModels.OrderStatusViewModel.set_State(OrderStateEnum value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 236 at Pulse.UI.ViewModels.OrderStatusViewModel.set_Status(OrderStatus value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 80 at Pulse.UI.Common.MarketData.&lt;MessageHandler&gt;b__a(OrderStatusViewModel vm, OrderStatus m) in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 219 at Pulse.UI.Common.MarketData.&lt;&gt;c__DisplayClass20`2.&lt;CollectionKeeper&gt;b__1f() in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 333 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Pulse.UI.App.Main() in C:\Serkan\Pulse Project\Pulse.UI\obj\x86\Release\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()</ExceptionString><DataItems><Data></Data></DataItems></Exception></TraceRecord>

New Post: Why is this collection keeps getting recreated everytime?

throb — Fri, 06 Jul 2012 08:46:52 GMT

I don't know which property is changing to cause the entire collection to update but what strikes me is that you seem to use an outer join between your grouped _orders and _quotes where you actually want to use an inner join.

With an outer join every group will need to be regarded when a relevant property of any _quote changes, as opposed to an inner join where only the associated groups will be checked.

Regs,

Thomas.

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Thu, 05 Jul 2012 13:37:29 GMT

        private void CreateQueries()
        {
            GridData =
                ExpressionObserver.Execute(() =>
                                               from o in _orders
                                               where o.State != OrderStateEnum.Canceled
                                               group o by o.Isin
                                               into g
                                               let germanSymbol = _referenceData.GetGermanSymbol(g.Key)
                                               let primarySymbol = _referenceData.GetPrimaryExchangeSymbol(g.Key)
                                               let name = _referenceData.GetInstrumentName(g.Key)
                                               orderby name ascending
                                               let primaryExchange = _referenceData.GetPrimaryExchangeId(g.Key)
                                               from q in _quotes
                                                   .Where(w => w.Isin == g.Key &&
                                                               w.Exchange == primaryExchange &&
                                                               w.Provider == ProviderEnum.Bloomberg).DefaultIfEmpty(
                                                                   new QuoteTickViewModel())
                                               select new ComplexRowViewModel()
                                                          {
                                                              Isin = g.Key,
                                                              Name = name,
                                                              GermanSymbol = germanSymbol,
                                                              PrimarySymbol = primarySymbol,
                                                              PrimaryExchange = new SimpleRowViewModel()
                                                                                    {
                                                                                        Ask = (decimal) q.Ask,
                                                                                        AskSize = q.AskSize,
                                                                                        Bid = (decimal) q.Bid,
                                                                                        BidSize = q.BidSize,
                                                                                        Exchange = q.Exchange,
                                                                                        Isin = q.Isin,
                                                                                        Last = (decimal) q.Last,
                                                                                        LastSize = q.LastSize,
                                                                                        LastTime = q.Time
                                                                                    },
                                                              Groupped =
                                                                  from qx in
                                                                      _quotes.Where(
                                                                          w =>
                                                                          w.Isin == g.Key &&
                                                                          w.Provider == ProviderEnum.Tradebase &&
                                                                          w.Exchange != primaryExchange)
                                                                  select new SimpleRowViewModel()
                                                                             {
                                                                                 Ask = (decimal) qx.Ask,
                                                                                 AskSize = qx.AskSize,
                                                                                 Bid = (decimal) qx.Bid,
                                                                                 BidSize = qx.BidSize,
                                                                                 Exchange = qx.Exchange,
                                                                                 Isin = qx.Isin,
                                                                                 Last = (decimal) qx.Last,
                                                                                 LastSize = qx.LastSize,
                                                                                 LastTime = qx.Time
                                                                             }
                                                          }
                        ).Cascade();
        }

As you see I got this query in my application. Top collection is orders which is almost static, but the nested Groupped collection is keeps getting updated. But insted of just updating the related properties, whole list getting recreated every update.

I was wondering if there is a solution for this ?

New Post: InvalidOperationException when removing items

steff79 — Tue, 26 Jun 2012 18:10:14 GMT

Many thanks, that did it.

New Post: InvalidOperationException when removing items

Throb — Mon, 25 Jun 2012 23:17:51 GMT

Hi,

Problem is that Select(modelItems, s => CreateViewModel(s)) uses the lambda expression both for adding and removing items. So; CreateViewModel(s) gets called when an item is added and when an item is removed. Now; if CreateViewModel(s) does not return an equal object every time it gets called with the same s then it means that a different object will be removed than was originaly added -> error.

You should create a method GetViewModel(s) instead of CreateViewModel(s), like:

TvdP.Collections.WeakValueDictionary<string,ItemViewModel> _registry = new TvdP.Collections.WeakValueDictionary<string,ItemViewModel>()

private static ItemViewModel GetViewModel(string s)
        {
            //this MUST be called in the UI thread because I access some thread-affine objects in my real application.
            return _registry.GetOrAdd(s, s2 => new ItemViewModel {Text = s2});
        }

New Post: InvalidOperationException when removing items

steff79 — Fri, 22 Jun 2012 09:16:03 GMT

Hi,

I have a scenario with a ListBox bound to a collection of ViewModels. This collection is actually a Obtics expression that binds further to a model. The model is changed by a background thread, so I use the WorkQueueOnDispatcherProvider to make sure the viewmodels are updated on the UI thread.

Adding items works perfectly fine, but removing them throws an InvalidOperationException in the ListBox (with strange message "Added item does not appear at given index").

I have no idea what I am doing wrong. Please help me.

I created a minimal example to reproduce the behaviour:

internal class MainViewModel
    {
        private readonly Model dummyModel;

        //for binding to a ListBox
        public IEnumerable<ItemViewModel> ItemCollection { get; private set; }

        public MainViewModel()
        {
            dummyModel = new Model {Items = new ObservableCollection<string>()};
            dummyModel.Items.Add("hello");
            dummyModel.Items.Add("world");

            IValueProvider<IEnumerable<string>> valueProvider =
                ExpressionObserver.Execute(() => Enumerable.Select(dummyModel.Items, s => s));

            //from what I figured out, I have to call Async() before I create the final ItemCollection expression so that
            //CreateViewModel() is called in the UI thread.
            IEnumerable<string> modelItems =
                valueProvider.Cascade().Async(new WorkQueueOnDispatcherProvider().GetWorkQueue());

            ItemCollection =
                ExpressionObserver.Execute(() => Enumerable.Select(modelItems, s => CreateViewModel(s))).Cascade();
        }

        private static ItemViewModel CreateViewModel(string s)
        {
            //this MUST be called in the UI thread because I access some thread-affine objects in my real application.
            return new ItemViewModel {Text = s};
        }

        public void StartOperation()
        {
            Task.Factory.StartNew(
                () =>
                {
                    Thread.Sleep(1000);
                    dummyModel.Items.RemoveAt(1);
                    //dummyModel.Items.Add("hello");
                });
        }
    }

    internal class ItemViewModel
    {
        public string Text { get; set; }
    }

    internal class Model
    {
        public ObservableCollection<string> Items { get; set; }
    }

And the necessary XAML part:

<Window.Resources>
        <ResourceDictionary>
            <WpfApplication1:MainViewModel x:Key="myMainViewModel">
            </WpfApplication1:MainViewModel>
        </ResourceDictionary>
    </Window.Resources>
    <StackPanel DataContext="{StaticResource ResourceKey=myMainViewModel}">
        <Button Click="Clicked">Start Remove</Button>
        <ListBox ItemsSource="{Binding Path=ItemCollection}"></ListBox>
    </StackPanel>

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Wed, 14 Dec 2011 15:44:04 GMT

I'm sorry for the late answer.

My Project is not entirely unit-testable. But I can say that it's just an observablecollection for items with inotifypropertchanged interface.

There are some nullable properties in items, I wanted to check them but right now I don't have time for that, I needed quick solutions and workarounds :)

New Post: Strange behavior

throb — Thu, 08 Dec 2011 23:58:50 GMT

Hi Vincent,

Haven't found the time yet to find out what is going on.

I hope to have an answer for you soon,

Regs

Thomas.

New Post: Strange behavior

vbouzon — Wed, 07 Dec 2011 21:29:56 GMT

Hi Throb,

Have you an idea about my issue ?

Thanks

Vincent

New Post: How do I join and aggregate two observable collections?

throb — Tue, 06 Dec 2011 18:57:12 GMT

Good that you found a solution. 'join into' syntax should work though but there may always be a bug.

Could you create a unit test that isolates your problem?

Regs,

Thomas.

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Tue, 06 Dec 2011 10:13:06 GMT

Sorry it was my Linq Expression. It should have been like this.

           var query = ExpressionObserver.Execute(() =>
                                                  from q in _quotes.Where(p => p.Provider == ProviderEnum.Bloomberg)
                                                  from qp in
                                                      _currencies.Where(
                                                          j => j.Isin == q.Isin && j.Exchange == q.Exchange && j.Provider == ProviderEnum.Tradebase)
                                                      .DefaultIfEmpty(new QuoteTickViewModel())
                                                  select
                                                      new
                                                          {
                                                              IsinB = q.Isin,
                                                              IsinT = qp.Isin,
                                                              ExchangeB = q.Exchange,
                                                              ExchangeT = qp.Exchange,
                                                              PriceB = q.Last,
                                                              PriceT = qp.Last,
                                                              ProviderB = q.Provider,
                                                              ProviderT = qp.Provider
                                                          }
               ).Cascade();

If I try it with a normal LINQ/SQL-Like syntax (join into) then it does not function.

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Mon, 05 Dec 2011 13:36:23 GMT

I think the problem is Anonymous types.. Is it possible?

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Fri, 02 Dec 2011 12:07:07 GMT

I can't get this query to work.

_query = ExpressionObserver.Execute(() =>

                                                (from q in _quotes
                                                where q.Exchange == "#FX" && q.Provider == ProviderEnum.Bloomberg

                                                //join qt in _currencies on q.Isin equals qt.Isin into joinObj1 from joinObj2 in joinObj1.DefaultIfEmpty(new QuoteTickViewModel())
                                                //where joinObj2.Provider == ProviderEnum.Tradebase

                                                 select q).Join(_currencies.Where(es => es.Provider == ProviderEnum.Tradebase)
                                                , i => i.Isin, x => x.Isin, (h, p) => new { blbisin = h.Isin, blbprice = h.Last, blbprovider = h.Provider, tbmxisin = p.Isin, tbmxprice = p.Last, tbmxprovider = p.Provider })
 
                                                ).Cascade();

First I've tried with normal LINQ expression to join and then I've wrote it as chained query. I can see the values in the grid but they are not updating.

Thanks.

New Post: How do I join and aggregate two observable collections?

throb — Sat, 26 Nov 2011 11:59:13 GMT

How would you do it using object linq?

if <exp> is your linq expression giving your result you would just do:

ExpressionObserver.Execute(<exp>)

In case your <exp> is supposed to return a collection of values do:

ExpressionObserver.Execute(<exp>).Cascade()

Regs,

Thomas

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Thu, 24 Nov 2011 21:33:13 GMT

I want to be able to do a simple left outer join (or just join) and then group (sum) some columns.

I couldn't figure out how is that possible with Obtics.

Thanks.